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Shareowners' Equity and Noncontrolling Interest (Accelerated Stock Repurchase) (Details) - USD ($) shares in Millions, $ in Billions | 3 Months Ended
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Sep. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015
November 11, 2015 ASR [Member] |  |  |
Accelerated Share Repurchases [Line Items] |  |  |
ASR Aggregate Purchase Price |  |  | $ 6
Stock Repurchased During Period, Shares |  |  | 51.9
January 19, 2016 settlement of ASR [Member] |  |  |
Accelerated Share Repurchases [Line Items] |  |  |
Stock Repurchased During Period, Shares |  | 2.1 |
September 14 and 15, 2016 final settlement of ASR [Member] |  |  |
Accelerated Share Repurchases [Line Items] |  |  |
Stock Repurchased During Period, Shares | 8.0 |  |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 + Details
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- Definition Aggregate purchase price to repurchase shares of common stock per the ASR agreement + References No definition available. + Details
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- Details
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